I believe Rocky Balboa put it best when he said, "Hey Tommy! I didn't hear no bell!"
The three people that saw Rocky V are laughing right now, but the rest of you can check out the clip so you can understand what I'm talking about.
Basically Rocky was rephrasing the famous line "It ain't over 'til it's over" in boxing terms, suggesting that no matter how down and defeated a fighter looks, anything can happen until that final bell rings.
Over the years many fighters have proven this dictum to be true, and those are the fighters that I'd like to celebrate today.
Here are the 20 most unexpected knockouts in fighting history.